Manufacture of dry-sealing envelopes



Dec. 14, 1937. v. E. HEYWOOD MANUFACTURE OF DRY SEALING ENVELOPES Filed July 16 s sheets-sheet 1 yLUOd I INVENTOR Lncerd: @He

ATTORNEY 14, 1037. E HEYW D 2,102,001

MANUFACTURE OF DRY SEALING ENVELOPES Filed July 16, 1934 6 Sheets-Sheet 2 m Y, N

N i a W INVENTORV Ham/9;: Hezuroidail ATTORNEY V. E. HEYWOOD MANUFACTURE OF DRY SEALING ENVELOPES Dec. 1%, 1937.

Filed July 16, 1954 6 Sheets-Sheet. 5

INVEYNTOR U 'i nceni 8. Heywood.

ATTORNEY 14, 1937. E HEYW D 2,102,001

MANUFACTURE OF DRY SEALING ENVEIJOPES Filed July '16, 1954 a sheets-sheet 4 INVENTOR U'mcen c 6. Hey wood.

w/6W2 B ATTORNEY v. E. HEYWOOD 2,102,001

MANUFACTURE OF DRY SEALING ENVELOPES Filed July 16, 1954 6 Dec. 14, 1937.

Sheets-Sheet 5 INVEN m Uinceni E. Heywood ATTORNEY Dec. 14, 1937. v. E. HEYWOOD MANUFACTURE OF DRY SEALING ENVELOPES Filed July 16, 1954 6 Sheets-Sheet 6 gwvmtoz U'mceni 5. Heywood tented ec. l4, l3?

MAUEWIE F lDRH- SEALING ELQPIES Vincent E. Heywood, Worcester, ltiiasa; assior to United States Envelope Company, fipringfield, ltilasa, a corporation oi inc Application July 16, 1934, Serial No. 735,326 1 22 @llaims.

The present invention relates to the manufacture of dry-sealing envelopes, that is, envelopes of the type in which corresponding areas of the seal flap and body of each envelope are coated with an adhesive that is adapted to adhere to itself upon contact, without however adhering to the uncoated material of the envelope.

In Conner Patent No. 94,399 dated August 31, 1869, there is shown and described an envelope of the above indicated character, in which is mentioned the necessity of packing such envelopes for use, with the seal flaps turned in to prevent accidental contact of the adhesive coated areas. Bearing in mind the inherent difliculty of turning in the gummed flaps of completed envelopes in the manner suggested in the Conner patent, the present invention contemplates an improved method and means for manufacturing such envelopes, whereby their seal flaps are, gummed and folded over upon themselves in advance of converting the envelope material into .completed articles.

.Furthermore, the present invention contemplates the manufacture of envelopes in the above indicated manner from either a continuous web of material, or separate blanks, with the necessary gumming of the envelope material being carried on continuously to thereby eliminate any tendency for the adhesive to string. Furthermore, the invention provides means for applying printed and coloring matter to the envelope material in process, so that such matter will dry simultaneously with the,gumming and before the performance of any folding operations,- with further provision of means for reinforcing portions ot the envelope material which are subsequently punched out to provide finger holding apertures. such as are provided in merchandising envelopes.

The above and other advantageous features of the invention will hereinafter more fully appear from the following description with reference to the accompanying drawings, in which:-

Fig. 1 is a view in side elevation of the right hand end portion of a machine forcarrying out the invention.

Fig. 2 is a view inside elevation of an' intermediate portion of the machine.

Fig. 3 is a view in side elevation of the left hand end portion of the machine.

Fig. 4 is a plan view of the portion of the machine shown in Fig. 3.

Fig. 5 is a plan 'view of machine shown in Fig. 2.

. Fig. 6 is a fragmentary sectional view along the the portion of the line 6-6ofFig. 1.

Fig. 7 is a vertical sectional view along the line 'l- -l of Fig. 12.

Fig. 8 is an enlarged fragmentary view of a portion of Fig. 3. v

Fig. 9 is a diagrammatic view in perspective, illustrating the progress of a web of envelope material through the machine and its subsequent conversion into envelopes.

Fig. 10 is a diagrammatic view in perspective, illustrating the progress ,of envelope blanks through the machine and the manner of gumming the same.

Figs. 11 and 12 are plan views of completed envelopes resulting from the practice of the invention.

Like reference characters refer to like parts the different figures.

Referring to the drawings, the invention will first be described with reference to the manufacture of envelopes from a continuous web of material, and it will hereinafter appear that the mechanism is also capable of handling separate blanks and converting them into envelopes of the same character as those produced from the web. In Fig. 1 a continuous web i of envelope material is mounted on'a reel 2, from which the web is drawn by rotatably driven rolls 3 and conveyed over the surface of a. platen roll t. A printing roll 5 having suitable characters thereon cooperates with the platen t to apply printed matter at'spaced intervals to the web i, as indicated at A in Fig. 9, after which the web is passed around a second platen roll 6. Qther printing rolls land 8 cooperating with the platen 6 serve to apply additional printed matter B and C to the web I at intervals, preferably vin registration with the printed matter A, as shown in Fig. -9.

The web I with the printed .matter applied at intervals on one side thereof is-next led upwardly around a guide roll 9 with which cooperates a fourth printing roll III that is adapted to apply "a tinted design D to the side of the web opposite to the printing. This tinting is preferably applied in the form of aniline dye which dries very rapidly soon after being applied. The tinted web then passes downwardly around a second guide roll 9a which delivers the web to a horizontally.

moving belt ll passing around a cylinder. I2. In its travel to the lower guide roll 9c, the web is deflected around the periphery of a gumming roll l3, which as shown in Fig. 6, engages one edge of the web, the other edge of the web being supported by an idler roll I] mounted on the same shaft [5 as the gumming roll l3. The roll I3 rotates in a trough I 6 containing adhesive of such a character that when dried, it adheres to any surface coated with the same adhesive, although it will not adhere to the material of the web I. Preferably, the adhesive in the trough I6 is in the form of a dispersed rubber solution, or as a natural or compounded latex, the invention also contemplating the use of other similar dry-sealing adhesives in the form of thermo-plastics, such as arclor resins or galyptols, either alone or in combination with rubber.

The other edge of the web I in passing over the idler roll I4 also has adhesive applied thereto by a gumming roll I! cooperating with the roll I4 and engaging the opposite surface of the web. This second gumming roll I! rotates in a trough I8 containing adhesive of the same character as that contained in the trough I6. Consequently, as the web I passes onto the belt II, it has continuous bands E and F of adhesive extending along its edges on opposite sides thereof, which bands extend beyond the belt II, as shown in Fig. '7. It will also be noted in Fig. '7 that the printed matter A, B, and C on the web is on the upper side thereof adjacent the band of gumming E, so that the printed matter is free from engagement with the belt II as the web passes into the dryer, the construction of which will be hereinafter described.

coincidentally with the gumming of the edges of the web by the rolls I3 and II, the web has applied thereto patches of reinforcing material located at portions of the web which are subsequently punched through to provide finger openings in the completed envelopes. As best shown in Fig. 6, the patches are adapted to be applied to the same side of the web by rolls I9 and 20 provided around their periphery with spaced projections 2| of frictional material which apply previously gummed patches of .predetermined length to the webat intervals corresponding with the spacing of the printed matter on the web. The

patch applying rolls I9 and 20 are mounted in spaced relation on the shaft 22, with the roll I9 adapted to apply the patches G along an edge of the web corresponding to the edge gumming E by the roll I3 but on the opposite side thereof. The other patch applying roll 20 is mounted adjacent to the gumming roll I'I so that the patches H applied by roll 20 extend in spaced relation on the same side as the band of gumming F, all as indicated clearly in Fig. 4.

The particular mechanism for applying the pat hes to the web forms no part of the present in ention, and a suitable mechanism for carrying out this purpose is shown in Brookes Patent No. 1,338,119 dated April 27, 1920. In Fig. 1 a portion of the patented patch applying mechanism is shown as comprising reels 23 for supplying the patch applying rolls I9 and 20, with the patch material from each reel 23 being operated upon by patch severing and gumming mechanism indicated at 24. Since this mechanism is fully shown and described in the above noted Brookes Patent No. 1,338,119 no further discussion thereof is believed necessary herein, other than to state that rotatio of the rolls I9 and 20 causes patches to be severed at intervals from the previously gummed and partially cut webs of patch material, with the gummed sides of the patches being applied to the web I at intervals, as indicated at G passes through a dryer generally designated by the reference character 25 and extending from the left hand end of Fig. 1 to the right hand end of Fig. 3. As shown in Fig. 7, the dryer 25 provides a long chamber 26 enclosed. between a top plate 21 and side walls 28, through which extend heating elements'shown in the form of steam pipes 29. The web I is supported in its travel through the chamber by guides 30, and the guides 30 are supported at intervals by sets of brackets 3| mounted on threaded cross shafts 32. The shafts are oppositely threaded so that by turning the shafts, the guides 30 are adjustable laterally of the chamber 26 to support webs of different widths. An enclosed passage 33 extends through the chamber 26, the top of the passage providing a perforated plate 34 for supporting the belt II which is also perforated. The passage 33 is connected to a source of suction, not shown, and the belt II traveling through the passage carries with it the web I due to the suction effect communicated through the perforations.

When the web I emerges from the dryer 25, as shown at the left in Fig. 3, the printed matter and bands of gumming thereon are thoroughly dried and the patches securely fastened to the web. The web then passes upwardly from the dryer 25 around the periphery of a drum 35, which reverses the direction of movement of the web and conveys it for operation upon by a series of cutters which are adapted to convert the web into separate envelope blanks preparatory to the folding operations. As best shown in Fig. 4, a rotatably driven shaft 36 carries cutters 31 and 38 which are adapted to form notches 39 and 40 along opposite edges of the web I. The web then passes between feed rolls 4|, after which it is operated upon by a third cutter 42 which is. adapted to sever the web at intervals along lines of cutting joining opposed notches 39 and 40. The operation of the cutter 42 therefore serves to divide the web into separate blanks Ia, each having bands of gumming along its edges on opposite sides and. with patches and printed matter applied to opposite surfaces of the blank. The

cutters 3T, 38 and 42 are of the so-called flying shear type and are driven by means of gearing 43 which operates to maintain the cutters in syn chronism. The particular manner ofdriving the cutters forms no part of the present invention, a

similar web cutting mechanism being fully shown and described in Sanders Patent No. 1,169,197

-of pull rolls 44 which deliver the blank between cooperating scoring disks 45. As best shown in Fig. 4, these disks 45 serve to score the blank transversely'along lines 46a and 46b, with the scoring 46a extending along themargin of the band of gumming F to define the seal flap of the completed envelope. (The scoring 461) extends substantially midway of the blank where the width of the blank changesand serves to divide the front wall from the back flap. Since the cutter 42 operates only once for each revolution of the cutter shaft 42a, theblanks are delivered to the rolls 44 at intervals, with adequate spacing between the blanks for proper carrying out of the folding operations whichare performed thereonafter the scoring, as will next be described.

As best shown in Fig. 3, each scored blank next passes between cooperating belts 41, with which are associated folding instrumentalities, not shown, which serve first to fold the blank along aioaooi the scoring Ma to turn the small seal flap over with its gummed surface in contact with the body ofthe *blank and then fold the blank along the scoring Mb to turnthe larger flap over into engagement with the previously folded seal flap, as indicated diagrammatically in Fig. 4. The particular folding instrumentalities are not shown, since such instrumentalities are well known in the art, as shown for example, in Staude Patent No. 1,144,506 dated June 29, 1915. In the folding over of first the small flap and then the largefiap as described above, it is obvious that there is no possibility' of the gummingEandFontheseilaps coming into contact and therefore adhering to each other, since the small flap which subsequently becomes the seal flap of the completed envelope is folded over to dispose its gumming F face downward against that portion of the blank which subsequently becomes the front wall of the envelope. The gumming F- on the seal flap exhibits no tendency to stick to the front wall, since as previously pointed out, the adhesiye is of such a character that when dried, it will only adhere to an area gummed with adhesive possessing the same char-- acteristics. The same holds true of the gumming E on the large flap, which while exposed on the portion of the blank which subsequently constitutes the rear wall of thecompleted envelope, en-

tirely overlies the gumming D and is separated from it by two thicknesses of ungummed paper. After the folding over of the two flaps as illustrated in Fig. 4, the partially folded blank is deliverd by belts dd against a stop t9, see Fig. 2, for operation upon by another set of instrumentalities shown inthe aforesaid Staude Patent No. 1,144,506 which serve to move the blank at right angles to its former movement and at the same time perform scoring, gumming and folding operations thereon which are illustrated diagrammatically in Fig. 5. Since these instrumentalities form no part of the present invention and are well known in the envelope making art, it is believed to be unnecessary to fully show and describe them herein, other than to state the general results accomplished by the operation of these instrumentalities. blank comes to rest against the stop d9, its direction of movement ischanged by the conveyor chains 58, as indicated by the arrows in Fig. 5, which deliver the blank to scoring disks 5! These disks ti score the blank along the lines 52 to define side flaps extending on either side of the body of the blank, and as the blank continues its travel, the side flaps are first gummed at 53 and then folded over to complete the envelope. A finished envelope appears as shown in Fig. 11, with its gummed seal flap turned in and with its rear wall providing a gummed area E corresponding to the concealed gummed area F on the seal flap. Envelopes made in the above described manner are therefore ready to be packed. without. any possibility of the dry-sealing adhesive areas E and F coming into engagement. When it is desired to utilize the envelope, it is only necessary to pull out the turned in seal flap, and after the envelope has been folded to turn down the seal flap to bring its gumming F into engagement with the gumming E on the rear wall. The application of pressure alone to the, overlying dry-sealing adhesive areas is then all that is necessary to completely seal the envelope.

Previous to the folding over of the side flaps to complete the envelope, the blank is operated upon by a. punch 54, which makes an aperture 55 extending through both the front and rear walls of As a partially folded the envelope and the interposed seal flap. The aperture 55 also extends through the alined patches G and H on the front and rear walls respectively. In the completed envelope these alined apertures 55 provide a convenient hand hole for the envelope after it has been closed by pulling out the seal flap and engaging it with the rear wall. Thus. the envelope is rendered extremely useful for carrying articles of merchandise, with the assurance that the articles cannot escape from the envelope after it has been scaled by the application of pressure to the overlying gummed areas E and F.

Referring now to Fig. 9, the progress of the web 6 through the machine is illustrated diagrammatically, so that various operations performed thereon in sequence may be readily understood. Starting from the reel 2,the printed matter A, B, and C is placed upon one side of the web by the successive operations of the printing rolls 5, l,

and 8, as indicated, and as the web starts downwardly toward the gumming and patching instrumentalities, the opposite side of the web from the printing is tinted by the roll it. In its passage downwardly from the roll ill the tinting D dries rapidly, as previously pointed out, and the opposite sides of the marginal portions of the web are then gummed, as indicated at E and F. At the same time two series of patches G and H are applied to the tinted side of the web at spaced intervals, following which the gummed, printed and patched web enters the'dryer. In its passage through the dryer, the printing and gumming is thoroughly dried, after which the web leaves the dryer and passes upwardly into another plane for operation upon by the cutting instrumentalities.

As designated in Fig. 9, cut #1 results in the I formation of the notches 39 and dll, and cut #2 severs the web at intervals between the notches to form completed blanks la. The blanks are advanced separately from the cutters and scoring lines are made across each blank as indicated at score #1, preparatory to folding over first the' gummed seal flap and then the .back flap, as indicated at fold #1 and fold #2 The partially folded blank is then registered and its direction changed at right angles to its previous line of travel, whereupon the scoring defining the side flaps is carried on as indicated at score #2. The side flaps are then gummed and folded to complete the envelope, as indicated at gum #3 and fold #3. Previous to the final folding to complete the envelope, the overlying patches G and H are punched to provide a finger-hole 55 extending through the end of the envelope, it

being obvious that the patching and punching may be omitted when it is desired to produce envelopes without finger-holes. Furthermore, it is obvious that the printing and tinting rolls may be omitted when it is desired -to produce envelopes having only the self-sealing feature represented by the tucked-in seal flap with its gum-- ming F in overlying relation to the gumming E on the rear wall.

As previously pointed out, the invention also contemplates the manufacture of envelopes from previously cut blanks, and there will next be de- 7 scribed the manner in which such blanks may be utilized by the same mechanisms'which handle the web I. Referring again to Fig. 1, a supply of blanks 5G is shown mountedupon a suitable support 51, from which the envelopes are adapted to be removed, one by one, by a suction operated picker 58 of a well known type. The

picker 58 is adapted to direct each blank 56 rolls a little in advance bf the trailing edge of the blank that is being gummed; and just prior to the arrival of the leading edge of an ungummed blank at the gummers, this edge is tucked in behind the trailing edge of the blank beinggummed. To this end, a deflector 63 is pivotally mounted adjacent to the chute 62, which is open on the left hand side to permit the deflector 63 to tuck the leading edge of one blank behind the trailing edge of the preceding blanks,

as indicated at the right in Fig. 10.

Thus the blanks 56 are disposed in shingled relation, which insures that continuous bands of gumming E and Fwill be applied to opposite edges of the overlapped blanks 56 as they travel into the dryer. The provision of overlapped edges makes it possible to apply the gumming without breaking contactjof the. rotating gumming elements I3 and llwith the edges of the blanks. This prevents any tendency for the drysealing adhesive to string at the edges of a blank, as would occur were separated blanks engaged by the gumming elements. This provision against stringing of the adhesive is very essential in A applying dry-sealing adhesives" of the type employed herein, since such adhesives have the property of stringing when moist, which stringiness disappears when such adhesives are thoroughly dry. The shingled blanks 56 gummed along their edges then proceed through the dryer substantially in'the form of a continuous web, as clearly shown in Fig. 10, and the functioning of the dryer is such that the gumming E and F is thoroughly dry by the time the blanks reach the left hand end of the machine shown in Fig. 3. At thispoint provision is made for separating the blanks 56 and conveying them upwardly one by one for operation upon by the Staude scoring and folding instrumentalities. ,The separating and conveying means consists of a pair of conveyor chains 64 passing around sprockets 65, which chains are provided at intervals with lifting fingers 66. As the leading edge of the first blank 56 of a series approaches the chains 64 on the moving belt II, a deflector 61 directs the blank onto the chains 64. This action is clearly .shown in Fig. 8, and as the trailing edge of the gers 66 on opposite sides of the belt H engage the trailing edge and serve to separate the blank from the series of shingled blanks on the belt I I.

The act of separating is brought about by the a higher lineal speed than the conveyor belt ll. Consequently, the fingers 66 give a distinct push to the trailing edge of the deflected blank which is quite suflicient to" break'the slight bond between this blank and the adjacent blank due to thebands of gumming El and F 1 The separation of each blank occurs just prior to the engagement of the next succeeding blank by the deflector 61, so that the blanks are conveyed upwardly 75 in a vertical plane by the chain 64 in separated first blank approaches the deflector 61,,the fin-- fact that the surfaces of the chains 64 travel at relation determined by the spacing of the lifting fingers 66 on the chains 64.

As a blank 56 carried by the fingers 66 reaches the top of the conveyor, it is deflected into a horizontal plane by a second deflector 68, so that the blanks are delivered in spaced relation to the pull rolls 44 for operation upon by the scoring rolls 45. From this point on, the operations upon each blank 56 are precisely the same as previously described with reference to the blanks l'a, as cut from the web I. The progress of the blanks 56 as described in detail above is shown diagrammatically in Fig. 10, from which it isevident that the mechanism of the present invention is adapted to make envelopes as readily from individual blanks as from a continuous web. of

envelope material.

In Fig. 10 there is also shown a modification I in the manner of applying patches I to the blanks 56 when it is desired to make envelopes having finger holes at the closed end thereof, as indicated at 69 in Fig. 12. With this form of envelope, single patches I are applied to the blanks 56 substantially midway of each blank just where the blank is to be subsequentlyscored and folded, as shown in Fig. 10. However, before folding the blank 56 along scoring 46b, an area of gumming I0 is applied to the blank on the opposite side of the scoring from the patch I, so that when fold #2 is completed, patch I will be solidly adhered to the rear wall of the completed envelope. Then, when the completed envelope is punched to provide the finger hole 69, as shown in Fig. 12, it is evident that the union between the patch I and rear' wall will prevent any articles within the envelope from coming out.

I claim:

1. The improvement in the manufacture of envelopes, which consists in providing a blank having separate areas thereof coated with dry-sealing adhesive, next folding the blank to bring one of said adhesive coated areas into engagement with an uncoated area and then folding the remainder of the blank to bring the other adhesive coated area into overlying relation with the first area with its adhesive uppermost in the completed en velope. I

2. The improvement in the manufacture of ent velopes, which consists in providing a blank having parallel edge areas coated with dry-sealing adhesive, next folding the blank along one edge to cover one adhesive coated area and then folding the remainder of the blank to dispose the adhesive coated areas in overlying relation. with the second area uppermost, followed by gumming and folding of other portions of the blank to complete the envelope.

3. The improvement in the manufacture of envelopes, which consists in simultaneously applying continuous bands of dry-sealing adhesive to the opposite sides of moving envelope material, then dividing the envelope material into individual blanks and then folding each blank to bring the bands of dry-sealing adhesive into overlying relation, but' facing in opposite directions.

4. The improvement in the manufacture of en velopes, which consists in applying bands of dry iaioaooi velopes, which consists in applying bands of drysealing adhesive to the opposed marginal portions of a traveling web of envelope material,-

then cutting said web. into separate blanks and then folding each blank to bring the dry-sealing adhesive hands into overlying relation but facing in opposite directions, followed by gumming and folding of other portions of the blank'to complete the envelope.

7. The improvement in the manufacture of envelopes, whichconsists infeeding envelope blanks web .ef envelope material, applying printed matter to the web, applying bands of dry-sealing adhesive to opposite sides of the web, dividing the web into blanks and then folding each blank into an envelope with the printed matter on the out:

side and with the bands of dry-sealing adhesive in overlying relation, but facing oppositely.

' 9. The improvement in the manufacture of envelopes, which consists in advancing a continuous web of envelope material, applying patches of reinforcing material at intervalsto the web,'applying continuous bands of dry-sealing adhesive to opposite sides of the web, dividing said web into blanks, and then folding each blank into a completed envelope wiph a patch inside and with the dry-sealing adhesive bands in overlying relation,

but facing oppositely.

10. The improvement in the manufacture of envelopes, which consists in advancing a continuous web of envelope material, applying patches of.

reinforcing material at intervals tothe web, applying continuous bands of dryesealing adhesive to opposite sides of the web, dividing said web into blanks, and then folding each blank into a completed envelope with a patch inside and with the dry-sealing adhesive bands in overlying relation but facing oppositely, followed by the formation of a finger opening in the envelope passing through said patch.

11. The improvement in the manufacture of envelopes, which consists in advancing a continuous web of envelope material, applying patches of reinforcing material at intervals to the web, applying continuous bands of dry-sealing adhesive to opposite sides of the web, dividing said web into blanks, and then folding each blank into a completed envelope with a patch inside and with the dry-sealing adhesive bands in overlying relation but facing oppositely, followed by the formation of a finger opening in the envelope passing through said patch and the overlying adhesive bands.

12. The improvement in the manufacture of envelopes, which consists in advancing a web of envelope material, tinting one side of said web with a quick drying dye, applying bands of dry sealing adhesive to opposite sides of said web,

.severing said web into separate blanks and then folding each blank into an envelope with the tinting inside and with the dry-sealing adhesive bands in overlying relation, but facing oppositely.

13. The improvement in the manufacture of envelopes, which consists in advancing a continuous web of envelope material, applying printed matter to one side thereof, tinting the side of ,the

web opposite from the printing with a quick drying dye, applying bands of dry-sealing adhesive to opposite sides of the web, severing the web into separate blanks and then folding each blank into an envelope, with the printing on the outside, the tinting on the inside, and with the dry-sealing.

adhesive bands in overlying relation, but facing oppositely.

14. The improvement in the manufacture of dry-sealing envelopes, which consists in feeding envelope blanks from a stack one at a time, overlapping'said blanks in shingled relation, simultaneously applying dry-sealing adhesive to opposite sides of said blanks, drying said adhesive separating the individual blanks from said shingled relation, folding the seal flaps and completing the envelopes.

15. The improvement in the manufacture of envelopes, which consists in feeding envelope blanks from a stack one at a time, overlapping said blanks in shingled relation, simultaneously applying continuous bands of dry-sealing adhesive to opposite sides of the continuously moving shingled blank assembly, drying said adhesive and completing the envelopes.

16.. The improvement in the manufacture of envelopes, which consists in simultaneously applying dry-sealing adhesive to opposite sides of advancing envelope material, dividing said material into blanks and then folding each blank so that the dry-sealing adhesive areas thereon are out of engagement in a completed envelope made rial into blanks and then folding each blank so that the dry-sealing adhesive areas" thereon are separated by a non-adhesive portion of the blank in a completed envelope.

18. The improvement in the manufacture of envelopes, which consists in simultaneously applying dry-sealing adhesive to opposite sides of envelope material, dividing said material intoblanks and then folding each blank so that the j dry-sealing adhesive areas thereon are disposed in overlying relation in a completed envelope, witha non-adhesive portion of said blank dis.- posed between said adhesive areas.

19. The improvement in the manufacture of envelopes, which consists in providing a blank having parallel edge areas coated with dry-sealing adhesive, next folding the blank along one edge to cover one dry-sealing adhesive area, and then gumming and folding the remainder of the blank to complete the envelope and to cause said drysealing adhesive areas to face in opposite directions in overlying relation, with the other drysealing adhesive area uppermost.

20. The improvement in the manufacture of envelopes, which consists in applying bands of dry-sealing adhesive to opposed marginal portions of a traveling web of envelope material, then cutting said web into separate blanks and gumming and. folding over portions ofceach blank to complete an envelopeiwith the bands of dry-sealing adhesive in overlying relation, but facing in oppo site directions in the completed envelope.

21. A step in the manufacture of an envelope having corresponding areas of its sealfiap and rear wall coated with dry-sealing adhesive, which consists-in folding over that portion of an envelope blank which later constitutes the seal flap to cover the dry-sealing adhesive-thereon, in advance of any other folding operations on the envelope blank.

2,102,001 22. A step in the manufacture of an envelope having corresponding areas of its seal flap and rear wall coated with dry-sealing adhesive, which consists in foldingover that portion of an envelope blank which later constitutes the seal flap 5 to engage the dry-sealing adhesive thereon with that portion of the blank which later constitutes the front wall of the envelope, in advance of foldpose the rear wall adhesive area ov seal flap, but facing oppositely thereto. v

' mcENT E. HEYWOOD. 

